Commit | Line | Data |
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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c672528a CC |
2 | /* |
3 | * Copyright (C) 2012 Google, Inc. | |
c672528a CC |
4 | */ |
5 | ||
9ee85b8b | 6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
ef748853 | 7 | |
404a6043 CC |
8 | #include <linux/device.h> |
9 | #include <linux/err.h> | |
c672528a | 10 | #include <linux/errno.h> |
c672528a CC |
11 | #include <linux/init.h> |
12 | #include <linux/io.h> | |
5bf6d1b9 | 13 | #include <linux/kernel.h> |
404a6043 CC |
14 | #include <linux/list.h> |
15 | #include <linux/memblock.h> | |
9cc05ad9 | 16 | #include <linux/rslib.h> |
c672528a | 17 | #include <linux/slab.h> |
5bf6d1b9 | 18 | #include <linux/uaccess.h> |
404a6043 | 19 | #include <linux/vmalloc.h> |
24c3d2f3 | 20 | #include <asm/page.h> |
c672528a | 21 | |
8bd4da0f KC |
22 | #include "ram_internal.h" |
23 | ||
c208f7d4 KC |
24 | /** |
25 | * struct persistent_ram_buffer - persistent circular RAM buffer | |
26 | * | |
27 | * @sig: | |
28 | * signature to indicate header (PERSISTENT_RAM_SIG xor PRZ-type value) | |
29 | * @start: | |
30 | * offset into @data where the beginning of the stored bytes begin | |
31 | * @size: | |
32 | * number of valid bytes stored in @data | |
33 | */ | |
c672528a CC |
34 | struct persistent_ram_buffer { |
35 | uint32_t sig; | |
808d0387 CC |
36 | atomic_t start; |
37 | atomic_t size; | |
8128d3aa | 38 | uint8_t data[]; |
c672528a CC |
39 | }; |
40 | ||
41 | #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */ | |
42 | ||
808d0387 CC |
43 | static inline size_t buffer_size(struct persistent_ram_zone *prz) |
44 | { | |
45 | return atomic_read(&prz->buffer->size); | |
46 | } | |
47 | ||
48 | static inline size_t buffer_start(struct persistent_ram_zone *prz) | |
49 | { | |
50 | return atomic_read(&prz->buffer->start); | |
51 | } | |
52 | ||
0405a5ce | 53 | /* increase and wrap the start pointer, returning the old value */ |
d5a9bf0b | 54 | static size_t buffer_start_add(struct persistent_ram_zone *prz, size_t a) |
0405a5ce RH |
55 | { |
56 | int old; | |
57 | int new; | |
663deb47 | 58 | unsigned long flags = 0; |
0405a5ce | 59 | |
663deb47 JF |
60 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
61 | raw_spin_lock_irqsave(&prz->buffer_lock, flags); | |
0405a5ce RH |
62 | |
63 | old = atomic_read(&prz->buffer->start); | |
64 | new = old + a; | |
017321cf | 65 | while (unlikely(new >= prz->buffer_size)) |
0405a5ce RH |
66 | new -= prz->buffer_size; |
67 | atomic_set(&prz->buffer->start, new); | |
68 | ||
663deb47 JF |
69 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
70 | raw_spin_unlock_irqrestore(&prz->buffer_lock, flags); | |
0405a5ce RH |
71 | |
72 | return old; | |
73 | } | |
74 | ||
75 | /* increase the size counter until it hits the max size */ | |
d5a9bf0b | 76 | static void buffer_size_add(struct persistent_ram_zone *prz, size_t a) |
0405a5ce RH |
77 | { |
78 | size_t old; | |
79 | size_t new; | |
663deb47 | 80 | unsigned long flags = 0; |
0405a5ce | 81 | |
663deb47 JF |
82 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
83 | raw_spin_lock_irqsave(&prz->buffer_lock, flags); | |
0405a5ce RH |
84 | |
85 | old = atomic_read(&prz->buffer->size); | |
86 | if (old == prz->buffer_size) | |
87 | goto exit; | |
88 | ||
89 | new = old + a; | |
90 | if (new > prz->buffer_size) | |
91 | new = prz->buffer_size; | |
92 | atomic_set(&prz->buffer->size, new); | |
93 | ||
94 | exit: | |
663deb47 JF |
95 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
96 | raw_spin_unlock_irqrestore(&prz->buffer_lock, flags); | |
0405a5ce RH |
97 | } |
98 | ||
a15d0b36 | 99 | static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, |
c672528a CC |
100 | uint8_t *data, size_t len, uint8_t *ecc) |
101 | { | |
102 | int i; | |
9cc05ad9 | 103 | |
c672528a | 104 | /* Initialize the parity buffer */ |
f2531f19 KC |
105 | memset(prz->ecc_info.par, 0, |
106 | prz->ecc_info.ecc_size * sizeof(prz->ecc_info.par[0])); | |
107 | encode_rs8(prz->rs_decoder, data, len, prz->ecc_info.par, 0); | |
c31ad081 | 108 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
f2531f19 | 109 | ecc[i] = prz->ecc_info.par[i]; |
c672528a CC |
110 | } |
111 | ||
112 | static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, | |
113 | void *data, size_t len, uint8_t *ecc) | |
114 | { | |
115 | int i; | |
9cc05ad9 | 116 | |
c31ad081 | 117 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
f2531f19 KC |
118 | prz->ecc_info.par[i] = ecc[i]; |
119 | return decode_rs8(prz->rs_decoder, data, prz->ecc_info.par, len, | |
c672528a CC |
120 | NULL, 0, NULL, 0, NULL); |
121 | } | |
c672528a | 122 | |
a15d0b36 | 123 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
808d0387 | 124 | unsigned int start, unsigned int count) |
c672528a CC |
125 | { |
126 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
127 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
128 | uint8_t *block; | |
129 | uint8_t *par; | |
c31ad081 AH |
130 | int ecc_block_size = prz->ecc_info.block_size; |
131 | int ecc_size = prz->ecc_info.ecc_size; | |
132 | int size = ecc_block_size; | |
9cc05ad9 | 133 | |
c31ad081 | 134 | if (!ecc_size) |
9cc05ad9 CC |
135 | return; |
136 | ||
808d0387 | 137 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
c31ad081 | 138 | par = prz->par_buffer + (start / ecc_block_size) * ecc_size; |
808d0387 | 139 | |
c672528a | 140 | do { |
9cc05ad9 | 141 | if (block + ecc_block_size > buffer_end) |
c672528a CC |
142 | size = buffer_end - block; |
143 | persistent_ram_encode_rs8(prz, block, size, par); | |
9cc05ad9 CC |
144 | block += ecc_block_size; |
145 | par += ecc_size; | |
808d0387 | 146 | } while (block < buffer->data + start + count); |
c672528a CC |
147 | } |
148 | ||
9cc05ad9 | 149 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
c672528a | 150 | { |
c672528a CC |
151 | struct persistent_ram_buffer *buffer = prz->buffer; |
152 | ||
c31ad081 | 153 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
154 | return; |
155 | ||
c672528a CC |
156 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
157 | prz->par_header); | |
c672528a CC |
158 | } |
159 | ||
9cc05ad9 | 160 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
c672528a CC |
161 | { |
162 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
163 | uint8_t *block; |
164 | uint8_t *par; | |
165 | ||
c31ad081 | 166 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
167 | return; |
168 | ||
c672528a CC |
169 | block = buffer->data; |
170 | par = prz->par_buffer; | |
808d0387 | 171 | while (block < buffer->data + buffer_size(prz)) { |
c672528a | 172 | int numerr; |
c31ad081 | 173 | int size = prz->ecc_info.block_size; |
c672528a CC |
174 | if (block + size > buffer->data + prz->buffer_size) |
175 | size = buffer->data + prz->buffer_size - block; | |
176 | numerr = persistent_ram_decode_rs8(prz, block, size, par); | |
177 | if (numerr > 0) { | |
ef748853 | 178 | pr_devel("error in block %p, %d\n", block, numerr); |
c672528a CC |
179 | prz->corrected_bytes += numerr; |
180 | } else if (numerr < 0) { | |
ef748853 | 181 | pr_devel("uncorrectable error in block %p\n", block); |
c672528a CC |
182 | prz->bad_blocks++; |
183 | } | |
c31ad081 AH |
184 | block += prz->ecc_info.block_size; |
185 | par += prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
186 | } |
187 | } | |
188 | ||
5ca5d4e6 | 189 | static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, |
c31ad081 | 190 | struct persistent_ram_ecc_info *ecc_info) |
9cc05ad9 CC |
191 | { |
192 | int numerr; | |
193 | struct persistent_ram_buffer *buffer = prz->buffer; | |
194 | int ecc_blocks; | |
1e6a9e56 | 195 | size_t ecc_total; |
9cc05ad9 | 196 | |
c31ad081 | 197 | if (!ecc_info || !ecc_info->ecc_size) |
9cc05ad9 CC |
198 | return 0; |
199 | ||
c31ad081 AH |
200 | prz->ecc_info.block_size = ecc_info->block_size ?: 128; |
201 | prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16; | |
202 | prz->ecc_info.symsize = ecc_info->symsize ?: 8; | |
203 | prz->ecc_info.poly = ecc_info->poly ?: 0x11d; | |
9cc05ad9 | 204 | |
c31ad081 AH |
205 | ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size, |
206 | prz->ecc_info.block_size + | |
207 | prz->ecc_info.ecc_size); | |
208 | ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size; | |
1e6a9e56 AV |
209 | if (ecc_total >= prz->buffer_size) { |
210 | pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n", | |
c31ad081 AH |
211 | __func__, prz->ecc_info.ecc_size, |
212 | ecc_total, prz->buffer_size); | |
9cc05ad9 CC |
213 | return -EINVAL; |
214 | } | |
215 | ||
1e6a9e56 | 216 | prz->buffer_size -= ecc_total; |
9cc05ad9 | 217 | prz->par_buffer = buffer->data + prz->buffer_size; |
c31ad081 AH |
218 | prz->par_header = prz->par_buffer + |
219 | ecc_blocks * prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
220 | |
221 | /* | |
222 | * first consecutive root is 0 | |
223 | * primitive element to generate roots = 1 | |
224 | */ | |
c31ad081 AH |
225 | prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly, |
226 | 0, 1, prz->ecc_info.ecc_size); | |
9cc05ad9 | 227 | if (prz->rs_decoder == NULL) { |
ef748853 | 228 | pr_info("init_rs failed\n"); |
9cc05ad9 | 229 | return -EINVAL; |
c672528a | 230 | } |
9cc05ad9 | 231 | |
f2531f19 KC |
232 | /* allocate workspace instead of using stack VLA */ |
233 | prz->ecc_info.par = kmalloc_array(prz->ecc_info.ecc_size, | |
234 | sizeof(*prz->ecc_info.par), | |
235 | GFP_KERNEL); | |
236 | if (!prz->ecc_info.par) { | |
237 | pr_err("cannot allocate ECC parity workspace\n"); | |
238 | return -ENOMEM; | |
239 | } | |
240 | ||
9cc05ad9 CC |
241 | prz->corrected_bytes = 0; |
242 | prz->bad_blocks = 0; | |
243 | ||
244 | numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer), | |
245 | prz->par_header); | |
246 | if (numerr > 0) { | |
ef748853 | 247 | pr_info("error in header, %d\n", numerr); |
9cc05ad9 CC |
248 | prz->corrected_bytes += numerr; |
249 | } else if (numerr < 0) { | |
7db688e9 | 250 | pr_info_ratelimited("uncorrectable error in header\n"); |
9cc05ad9 CC |
251 | prz->bad_blocks++; |
252 | } | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, | |
258 | char *str, size_t len) | |
259 | { | |
260 | ssize_t ret; | |
261 | ||
bd08ec33 AH |
262 | if (!prz->ecc_info.ecc_size) |
263 | return 0; | |
264 | ||
9cc05ad9 CC |
265 | if (prz->corrected_bytes || prz->bad_blocks) |
266 | ret = snprintf(str, len, "" | |
023bbde3 | 267 | "\nECC: %d Corrected bytes, %d unrecoverable blocks\n", |
9cc05ad9 CC |
268 | prz->corrected_bytes, prz->bad_blocks); |
269 | else | |
023bbde3 | 270 | ret = snprintf(str, len, "\nECC: No errors detected\n"); |
9cc05ad9 CC |
271 | |
272 | return ret; | |
273 | } | |
274 | ||
a15d0b36 | 275 | static void notrace persistent_ram_update(struct persistent_ram_zone *prz, |
808d0387 | 276 | const void *s, unsigned int start, unsigned int count) |
9cc05ad9 CC |
277 | { |
278 | struct persistent_ram_buffer *buffer = prz->buffer; | |
7e75678d | 279 | memcpy_toio(buffer->data + start, s, count); |
808d0387 | 280 | persistent_ram_update_ecc(prz, start, count); |
9cc05ad9 CC |
281 | } |
282 | ||
5bf6d1b9 MS |
283 | static int notrace persistent_ram_update_user(struct persistent_ram_zone *prz, |
284 | const void __user *s, unsigned int start, unsigned int count) | |
285 | { | |
286 | struct persistent_ram_buffer *buffer = prz->buffer; | |
ff847781 | 287 | int ret = unlikely(copy_from_user(buffer->data + start, s, count)) ? |
5bf6d1b9 MS |
288 | -EFAULT : 0; |
289 | persistent_ram_update_ecc(prz, start, count); | |
290 | return ret; | |
291 | } | |
292 | ||
201e4aca | 293 | void persistent_ram_save_old(struct persistent_ram_zone *prz) |
9cc05ad9 CC |
294 | { |
295 | struct persistent_ram_buffer *buffer = prz->buffer; | |
808d0387 CC |
296 | size_t size = buffer_size(prz); |
297 | size_t start = buffer_start(prz); | |
9cc05ad9 | 298 | |
201e4aca AV |
299 | if (!size) |
300 | return; | |
c672528a | 301 | |
201e4aca AV |
302 | if (!prz->old_log) { |
303 | persistent_ram_ecc_old(prz); | |
304 | prz->old_log = kmalloc(size, GFP_KERNEL); | |
305 | } | |
306 | if (!prz->old_log) { | |
ef748853 | 307 | pr_err("failed to allocate buffer\n"); |
c672528a CC |
308 | return; |
309 | } | |
310 | ||
808d0387 | 311 | prz->old_log_size = size; |
d771fdf9 AB |
312 | memcpy_fromio(prz->old_log, &buffer->data[start], size - start); |
313 | memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start); | |
c672528a CC |
314 | } |
315 | ||
a15d0b36 | 316 | int notrace persistent_ram_write(struct persistent_ram_zone *prz, |
c672528a CC |
317 | const void *s, unsigned int count) |
318 | { | |
319 | int rem; | |
320 | int c = count; | |
808d0387 | 321 | size_t start; |
c672528a | 322 | |
808d0387 | 323 | if (unlikely(c > prz->buffer_size)) { |
c672528a CC |
324 | s += c - prz->buffer_size; |
325 | c = prz->buffer_size; | |
326 | } | |
808d0387 | 327 | |
484dd30e | 328 | buffer_size_add(prz, c); |
808d0387 CC |
329 | |
330 | start = buffer_start_add(prz, c); | |
331 | ||
332 | rem = prz->buffer_size - start; | |
333 | if (unlikely(rem < c)) { | |
334 | persistent_ram_update(prz, s, start, rem); | |
c672528a CC |
335 | s += rem; |
336 | c -= rem; | |
808d0387 | 337 | start = 0; |
c672528a | 338 | } |
808d0387 | 339 | persistent_ram_update(prz, s, start, c); |
c672528a | 340 | |
9cc05ad9 | 341 | persistent_ram_update_header_ecc(prz); |
c672528a CC |
342 | |
343 | return count; | |
344 | } | |
345 | ||
5bf6d1b9 MS |
346 | int notrace persistent_ram_write_user(struct persistent_ram_zone *prz, |
347 | const void __user *s, unsigned int count) | |
348 | { | |
349 | int rem, ret = 0, c = count; | |
350 | size_t start; | |
351 | ||
5bf6d1b9 MS |
352 | if (unlikely(c > prz->buffer_size)) { |
353 | s += c - prz->buffer_size; | |
354 | c = prz->buffer_size; | |
355 | } | |
356 | ||
357 | buffer_size_add(prz, c); | |
358 | ||
359 | start = buffer_start_add(prz, c); | |
360 | ||
361 | rem = prz->buffer_size - start; | |
362 | if (unlikely(rem < c)) { | |
363 | ret = persistent_ram_update_user(prz, s, start, rem); | |
364 | s += rem; | |
365 | c -= rem; | |
366 | start = 0; | |
367 | } | |
368 | if (likely(!ret)) | |
369 | ret = persistent_ram_update_user(prz, s, start, c); | |
370 | ||
371 | persistent_ram_update_header_ecc(prz); | |
372 | ||
373 | return unlikely(ret) ? ret : count; | |
374 | } | |
375 | ||
c672528a CC |
376 | size_t persistent_ram_old_size(struct persistent_ram_zone *prz) |
377 | { | |
378 | return prz->old_log_size; | |
379 | } | |
380 | ||
381 | void *persistent_ram_old(struct persistent_ram_zone *prz) | |
382 | { | |
383 | return prz->old_log; | |
384 | } | |
385 | ||
386 | void persistent_ram_free_old(struct persistent_ram_zone *prz) | |
387 | { | |
388 | kfree(prz->old_log); | |
389 | prz->old_log = NULL; | |
390 | prz->old_log_size = 0; | |
391 | } | |
392 | ||
fce39793 AV |
393 | void persistent_ram_zap(struct persistent_ram_zone *prz) |
394 | { | |
395 | atomic_set(&prz->buffer->start, 0); | |
396 | atomic_set(&prz->buffer->size, 0); | |
397 | persistent_ram_update_header_ecc(prz); | |
398 | } | |
399 | ||
9d843e8f MO |
400 | #define MEM_TYPE_WCOMBINE 0 |
401 | #define MEM_TYPE_NONCACHED 1 | |
402 | #define MEM_TYPE_NORMAL 2 | |
403 | ||
027bc8b0 TL |
404 | static void *persistent_ram_vmap(phys_addr_t start, size_t size, |
405 | unsigned int memtype) | |
c672528a | 406 | { |
404a6043 CC |
407 | struct page **pages; |
408 | phys_addr_t page_start; | |
409 | unsigned int page_count; | |
410 | pgprot_t prot; | |
411 | unsigned int i; | |
2b1321e4 | 412 | void *vaddr; |
404a6043 CC |
413 | |
414 | page_start = start - offset_in_page(start); | |
415 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); | |
416 | ||
9d843e8f MO |
417 | switch (memtype) { |
418 | case MEM_TYPE_NORMAL: | |
419 | prot = PAGE_KERNEL; | |
420 | break; | |
421 | case MEM_TYPE_NONCACHED: | |
027bc8b0 | 422 | prot = pgprot_noncached(PAGE_KERNEL); |
9d843e8f MO |
423 | break; |
424 | case MEM_TYPE_WCOMBINE: | |
027bc8b0 | 425 | prot = pgprot_writecombine(PAGE_KERNEL); |
9d843e8f MO |
426 | break; |
427 | default: | |
428 | pr_err("invalid mem_type=%d\n", memtype); | |
429 | return NULL; | |
430 | } | |
404a6043 | 431 | |
b8f52d89 | 432 | pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL); |
404a6043 | 433 | if (!pages) { |
ef748853 FF |
434 | pr_err("%s: Failed to allocate array for %u pages\n", |
435 | __func__, page_count); | |
2b1321e4 | 436 | return NULL; |
404a6043 CC |
437 | } |
438 | ||
439 | for (i = 0; i < page_count; i++) { | |
440 | phys_addr_t addr = page_start + i * PAGE_SIZE; | |
441 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); | |
442 | } | |
2b1321e4 | 443 | vaddr = vmap(pages, page_count, VM_MAP, prot); |
404a6043 | 444 | kfree(pages); |
2b1321e4 | 445 | |
831b624d BY |
446 | /* |
447 | * Since vmap() uses page granularity, we must add the offset | |
448 | * into the page here, to get the byte granularity address | |
449 | * into the mapping to represent the actual "start" location. | |
450 | */ | |
451 | return vaddr + offset_in_page(start); | |
2b1321e4 AV |
452 | } |
453 | ||
027bc8b0 | 454 | static void *persistent_ram_iomap(phys_addr_t start, size_t size, |
1227daa4 | 455 | unsigned int memtype, char *label) |
24c3d2f3 | 456 | { |
027bc8b0 TL |
457 | void *va; |
458 | ||
1227daa4 | 459 | if (!request_mem_region(start, size, label ?: "ramoops")) { |
9ee85b8b KC |
460 | pr_err("request mem region (%s 0x%llx@0x%llx) failed\n", |
461 | label ?: "ramoops", | |
24c3d2f3 AV |
462 | (unsigned long long)size, (unsigned long long)start); |
463 | return NULL; | |
464 | } | |
465 | ||
027bc8b0 TL |
466 | if (memtype) |
467 | va = ioremap(start, size); | |
468 | else | |
469 | va = ioremap_wc(start, size); | |
470 | ||
831b624d BY |
471 | /* |
472 | * Since request_mem_region() and ioremap() are byte-granularity | |
473 | * there is no need handle anything special like we do when the | |
474 | * vmap() case in persistent_ram_vmap() above. | |
475 | */ | |
027bc8b0 | 476 | return va; |
24c3d2f3 AV |
477 | } |
478 | ||
2b1321e4 | 479 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
027bc8b0 | 480 | struct persistent_ram_zone *prz, int memtype) |
2b1321e4 | 481 | { |
d3b48769 AV |
482 | prz->paddr = start; |
483 | prz->size = size; | |
484 | ||
24c3d2f3 | 485 | if (pfn_valid(start >> PAGE_SHIFT)) |
027bc8b0 | 486 | prz->vaddr = persistent_ram_vmap(start, size, memtype); |
24c3d2f3 | 487 | else |
1227daa4 KC |
488 | prz->vaddr = persistent_ram_iomap(start, size, memtype, |
489 | prz->label); | |
24c3d2f3 | 490 | |
404a6043 | 491 | if (!prz->vaddr) { |
2b1321e4 AV |
492 | pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__, |
493 | (unsigned long long)size, (unsigned long long)start); | |
404a6043 CC |
494 | return -ENOMEM; |
495 | } | |
496 | ||
831b624d | 497 | prz->buffer = prz->vaddr; |
404a6043 CC |
498 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
f568f6ca | 503 | static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig, |
76d5692a | 504 | struct persistent_ram_ecc_info *ecc_info) |
404a6043 | 505 | { |
bb4206f2 | 506 | int ret; |
7684bd33 | 507 | bool zap = !!(prz->flags & PRZ_FLAG_ZAP_OLD); |
c672528a | 508 | |
c31ad081 | 509 | ret = persistent_ram_init_ecc(prz, ecc_info); |
0eed84ff KC |
510 | if (ret) { |
511 | pr_warn("ECC failed %s\n", prz->label); | |
bb4206f2 | 512 | return ret; |
0eed84ff | 513 | } |
c672528a | 514 | |
cbe7cbf5 AV |
515 | sig ^= PERSISTENT_RAM_SIG; |
516 | ||
517 | if (prz->buffer->sig == sig) { | |
30696378 JFG |
518 | if (buffer_size(prz) == 0) { |
519 | pr_debug("found existing empty buffer\n"); | |
520 | return 0; | |
521 | } | |
522 | ||
808d0387 | 523 | if (buffer_size(prz) > prz->buffer_size || |
7684bd33 | 524 | buffer_start(prz) > buffer_size(prz)) { |
ef748853 FF |
525 | pr_info("found existing invalid buffer, size %zu, start %zu\n", |
526 | buffer_size(prz), buffer_start(prz)); | |
7684bd33 PW |
527 | zap = true; |
528 | } else { | |
ef748853 FF |
529 | pr_debug("found existing buffer, size %zu, start %zu\n", |
530 | buffer_size(prz), buffer_start(prz)); | |
c672528a CC |
531 | persistent_ram_save_old(prz); |
532 | } | |
533 | } else { | |
ef748853 FF |
534 | pr_debug("no valid data in buffer (sig = 0x%08x)\n", |
535 | prz->buffer->sig); | |
7684bd33 PW |
536 | prz->buffer->sig = sig; |
537 | zap = true; | |
c672528a CC |
538 | } |
539 | ||
7684bd33 PW |
540 | /* Reset missing, invalid, or single-use memory area. */ |
541 | if (zap) | |
542 | persistent_ram_zap(prz); | |
c672528a | 543 | |
bb4206f2 AV |
544 | return 0; |
545 | } | |
546 | ||
d3b48769 AV |
547 | void persistent_ram_free(struct persistent_ram_zone *prz) |
548 | { | |
beeb9432 AV |
549 | if (!prz) |
550 | return; | |
551 | ||
552 | if (prz->vaddr) { | |
553 | if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { | |
831b624d BY |
554 | /* We must vunmap() at page-granularity. */ |
555 | vunmap(prz->vaddr - offset_in_page(prz->paddr)); | |
beeb9432 AV |
556 | } else { |
557 | iounmap(prz->vaddr); | |
558 | release_mem_region(prz->paddr, prz->size); | |
559 | } | |
560 | prz->vaddr = NULL; | |
d3b48769 | 561 | } |
f2531f19 KC |
562 | if (prz->rs_decoder) { |
563 | free_rs(prz->rs_decoder); | |
564 | prz->rs_decoder = NULL; | |
565 | } | |
566 | kfree(prz->ecc_info.par); | |
567 | prz->ecc_info.par = NULL; | |
568 | ||
d3b48769 | 569 | persistent_ram_free_old(prz); |
1227daa4 | 570 | kfree(prz->label); |
d3b48769 AV |
571 | kfree(prz); |
572 | } | |
573 | ||
f568f6ca | 574 | struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, |
027bc8b0 | 575 | u32 sig, struct persistent_ram_ecc_info *ecc_info, |
1227daa4 | 576 | unsigned int memtype, u32 flags, char *label) |
8cf5aff8 AV |
577 | { |
578 | struct persistent_ram_zone *prz; | |
579 | int ret = -ENOMEM; | |
580 | ||
581 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); | |
582 | if (!prz) { | |
ef748853 | 583 | pr_err("failed to allocate persistent ram zone\n"); |
8cf5aff8 AV |
584 | goto err; |
585 | } | |
586 | ||
76d5692a | 587 | /* Initialize general buffer state. */ |
e9a330c4 | 588 | raw_spin_lock_init(&prz->buffer_lock); |
76d5692a | 589 | prz->flags = flags; |
e163fdb3 | 590 | prz->label = kstrdup(label, GFP_KERNEL); |
76d5692a | 591 | |
027bc8b0 | 592 | ret = persistent_ram_buffer_map(start, size, prz, memtype); |
8cf5aff8 AV |
593 | if (ret) |
594 | goto err; | |
595 | ||
76d5692a | 596 | ret = persistent_ram_post_init(prz, sig, ecc_info); |
beeb9432 AV |
597 | if (ret) |
598 | goto err; | |
8cf5aff8 | 599 | |
dc80b1ea KC |
600 | pr_debug("attached %s 0x%zx@0x%llx: %zu header, %zu data, %zu ecc (%d/%d)\n", |
601 | prz->label, prz->size, (unsigned long long)prz->paddr, | |
602 | sizeof(*prz->buffer), prz->buffer_size, | |
603 | prz->size - sizeof(*prz->buffer) - prz->buffer_size, | |
604 | prz->ecc_info.ecc_size, prz->ecc_info.block_size); | |
605 | ||
8cf5aff8 AV |
606 | return prz; |
607 | err: | |
beeb9432 | 608 | persistent_ram_free(prz); |
8cf5aff8 AV |
609 | return ERR_PTR(ret); |
610 | } |